Expansion-reamer.



D. H. DUGAR.

EXPANSION BEAMER.

APPLICATION FILED Ausno. I9I5.

Patented (IGI. 24,1916.

3 SHEETS-SHEET I.

n. H. DUGAR. I

EXPANSION BEAMER.

APPLICATION FILED-Auen). |1915.

1,202,169. Patented Oct. 24, 1916.

I 3 SHEETS-SHEET 2.

4P 52 3e 6 Z5 7e u 76 lll 75 46 ./6 /7 37 45' /623 n. H. DUGAVR. v.EXPANSION REAMER.l

| ILED AuG.10. i915. l

Patented Oct. 24,1916.

3 SHEET sssssss 3.

DELANO H. DUGAR, OF ELYRIA, OHIO.

EXPANSION-BEAMER.

Speeication of Letters Patent.

Patented Oct. 24, 1916.

Application filed August 10, 1915. Serial No. 44,701.

5 and State of Ohio, have invented certain new and useful Improvementsin Expansion-Reamers; and I hereby declare the following to be a full,clear, and exact description of the invention, such as will enable 10others skilled in the art to which is pertains to make and use the same.This invention relates to new and useful improvements in expansionreamers.

One object ofthis invention is to provide 15 new and improved means forsupporting and connecting the body or blade carrying portion of thereamer with the shank portion so that the body portion will have aslight movement independent of the shank transversely of the axis of theshank permitting the body portion to float with respect to thesupportingspin'dle and thereby compensate `for any eccentricity of thespindle.

A further object of this invention is to provide a new and improveddriving connection between the shank and the body portion so thatthestrain will be equally distributed when the tool is being driven.

` A further object of my invention is to provide new and simple meansfor mounting the cutting blades in the body which will permit delicateadjustment thereof and posi- -tive locking of the blades in positionafter they have been adjusted.

My invention further consists in the features of construction andcombination of `parts hereinafter described in the specification,pointed out in the claims and illustrated in the accompanying drawings.

Again referring to the drawings, Figure 1 is a bottom planof a reamerembodying my invention. Fig. 2 is a section on line 2-2, Fig. 1. Fig. 3is a section on line 3-3, Fig. 2. Fig. 4 is a sectionon line 4 4, Fig.2. Fig. 5 is a section on line 5 5, Fig. 4. Fig. Gis a section on line6-6, Fig. 2. Fig. 7 is asection on line 7--7, Fig. 2.

Like parts are identified by the same reference numerals throughout theseveral views', but it will be understood that the use of the wordslippen verticah horizontal, lower, etc., are used relatively withreference tothe position of the parts on the sheets of drawings as thereamer may be used in any position desired. K

Again referring to the drawings, 10 represents the shank of my improvedreamer which is adapted toit into a socket in the end of the spindle aof a boring machine. On the lower end of the shank l0 is formed anannular Harige l1 in which are formed two diametrically oppositeopenings 12, and in said openings are secured pins 13 which extend downbelow the lower surface of said flange l1. In the bottom face of saidflange are formed four cavities or seats 14 in which are arranged plugsl5 of hardened steel. Small holes 16 are formed in the top surface ofthe flange 11 and communicate with said cavities 14, the said holesbeing adapted to receive a tool for knocking out the plugs 15 when lthevexposed surfaces thereof become worn. At the center of the shank l0 sformed a bore 17 which extends upwardly from the vlower surface of theshank and the inner end of the bore is tapered or conical shaped asshown at 18.

The'blade carrying portion of the reamer is exteriorly cylindrical inshape, but at its upper end the outer circumference thereof is reducedforming a neck portion 23 which 1s provided with an exterior screwthread. In the said neck portion 23 is formed a circular cavity 'orsocket 24 and the Wall of the said cavity 24 is screw threaded adjacentto the upper end of said cavity. The

circumference of the said cavity is slightly greater'than thecircumference of the flange l1 on'the shank 10 so that when the saidshank is inserted in said cavity the blade carrying portion can move orshifttransversely of the axis of the shank portion, or, as it istechnically termed, can float on the shank portion. The part of theblade carrying portion below the neck portion, 'indicated byv 25, willhereinafter be termed the body portion, and in said body portionfisformed an annular cavity 26 which extends upwardly from the bottomsurface of the body portion. The diameter of said cavity 26 is increaseda shortk distance from the lower end forming a shoulder 27, and thewallof the cavity below said shoulder is provided with a screw thread. Thepart of the body portion which extends down centrally and forms theinner Wall of said cavity 26, and which is indicated by 28, willhereinafter be termed the hub portion. The

lower end of this hub portion is reduced in diameter, as shown at 29,and is ascrew threaded. In the bottom wall ofthe cavity ilo 24 in theneck portion are formed two openings 32 which are arranged diametricallyopposite each other7 and in said openings are secured pins 33, and whentheshank and blade carrying portions are in their assembled position thesaid pins 33 extend in a vertical plane at a ring angle to the verticalplane of the pins 13V on the flange `11. In the upper surface of thebottom wall of said cavity 24 are also formed four cavities 35 in whichare arranged plugs 36 of hardened steel, and the said plugs 36 intheassembled position of the shank and blade carrying portion are inline with each other and form bearing surfaces for ball bearings as willappear later. Within the said cavity is arranged a circular plate ordisk 37 which is adapted to rest on the bottom wall of said cavity, andthe diameter of this disk is less than the diameter of the cavity. Inthe said disk 37 are formed four U-shaped openings or slots 38 whichextend inwardly from the perimeter of the disk and are spaced apartequal distances circumferentially, and when the reainer'is assembled'the two pins 33 will extend up through two diametrically'oppositenotches in said disk and the pms 13 will extend down through the othertwo diametrically opposite notches in said disk thereby forming anyoperative connection between the shank portion and the blade carryingportion. Rollers 39 are mounted in the sides of the pins 13 and 33 wheresaid pins extend into the openings 38 in said disk 37 and formanti-friction rollers. These rollers are arranged at opposite sides ofeach pair of pins'and project slightly beyond the peripheral surfacesofthe pins so as to contact with the adjacent side Walls of saidopenings 38. In the said disk 37 are also formed circular openings 40which extend entirely through said disk and are in line with the hardsteel plugs in the bottom wall of the cavity 24 and in the under surfaceof tlre flange 11. In said openings 40 are mounted balls 41 which areslightly larger in diameter than the thickness of said disk, and saidballs 41 form roller bearings between the bottom of the cavity 24 andunder surface of the flange 11. A locking ring 43 is screwed into theupper end of the cavity 24 above the flange'll, and the inner diameterof said ring is slightly greater than the diameter of the shank 10leaving a clearance between the shank and the said ring. Any suitablepacking 45 is arranged between the upper surface of said ring 43 and theend ofthe spindle. In the disk 37 is formed a centrally arranged opening4G which is of the same diameter as the bore 17 in the shank. A bore 47is formed in the hub portion 28 and extends from the lowei` end of saidhub portion through the bottom wall of the cavity 24, which bore hasthesarne diameter as the bore 17 in the shank and the opening 46 in thedisk. At

-the lower end of said bore 47 is formed an inwardly extending annularshoulder 48, and in the side wall of the said bore is formed alongitudinally extending slot 49. An interiorly screw threaded sleeve 50is arranged soa's to fit closely in the said bores 17, 46 and 47 and yetbe capable of sliding longitudinallythrough said bores. The said sleeveis made of such a length that in one extreme position thereof it will beentirely within the bore 47, but in its other extreme position a portionof said sleeve 50 will be in the bore 47 and the remainder of the sleevewill extend through the opening or bore 46 and linto the bore 17.Therefore,

when the sleeve 50 is in this positionithe` blade carrying portion ofthe reamer land the shank portion are locked together so that neithercan shift transversely of the other. That is,"when the sleeve is inthisposition the floating of the blade carryin portion of the reamer 'isprevented. screw 51 is inserted through the lower end of the bore 47 andthe thread 4thereon is arranged to engagelthe interior screw thread ofthel sleeve 50. A pin 52 is secured in the sleeve 50 and extends intothe slot 49. Now, when the screw 51 is turned in one direction thesleeve is drawn down into the bore 47 leaving the body or blade carryingportion free to float, and when the screw 51 is turned in the oppositedirection the sleeve passes through the bore 46 and enters the bore 17thereby positively preventing any rivement of the blade carrying portionindependent of the shank portion and bringing their axes into absolutealinement.

The arrangement for mounting and adjusting the blades in the bladecarrying portion of the reamer is as follows z--In the body portion ofthe reamer are formed a plurality of peripheral radially arranged andlongitudinally extending blade receiv ing slots 60, and toward the lowerend vof the body portion said slots extend completely through the wallof the cavity 26. The blades 61 are mounted in the said slots so as tobe snugly held therein and the lower rear portion of each blade extendsthrough the slo't and enters the said cavity 26. The bladesaretrapeziform, the outer or cutting edge of'ea'ch blade being straightand extending parallel with the axis of the reamer, the base of theblade being arranged at a right angle to the cutting edge, the inneredge being inclined upwardly and the `top edge being inclined outwardlyand downwardly. At the inner edge of each blade is formed a notch 62,the side walls of said notch beinginclined upwardly with respect to thebaseof the blade.

In the cavity 26 around the hub 28 is arranged an exteriorlyscrew-threaded sleeve 65 which is of equal length withthe 66 on thesleeve 65.

said hub and is adapted to turn or revolve on said hub. Toward its outerend the inexterior diameter is decreased forming aV shoulder 67. A nut68 is screwed onto the end of the hub and overlaps the shoulder Spannerholes 69 are formed in the exposed end of the sleeve -to permit the saidsleeves being engaged by a tool when it is desired to turn the saidsleeve on the hub. On he sleeve 65 is arranged a screw threaded collar70, the threads of which are arranged to engage the threads on the saidsleeve 65. On the periphery of the said colla-r 70 are formed a seriesof outwardly projecting lugs 71 which are equal in number to the numberof blade holding slots and are similarly spaced and are adapted tosnugly'it into said slots. The said lugs are also arranged to lit intothe notches 62 in the blades 61. The bottom edge of the said collar 7 0is slightly beveled, as shown at 73. A ring 74 is screwed into the lowerend of the body portion, and the inner side thereof overlaps theexterior shoulder 67 on the sleeve 65. The said ring 74; is provided atits upper end -with a beveled seat 75 which corresponds to the bevel onthe collar 70. Locking screws 76 are screwed into the said ring and thebody portion which lock the ring against movement, and the lower ends ofsaid screws also of the blades. On the neck portion 23 is arranged aclamping ring 77 the lower edge the top edge of the cutting blade, andthe top edge is also beveled and is cut or notched, as at 79. Above theclamping ring 77 is arranged a lock ring 80 which is adapted to screwdown ony top of the clamping ring 7 t34 and is interiorly beveled so asto engage the notched portion of the said clamping ring and squeeze thesame tightly on t-he threads of the neck portion 23 to elfectually lockthe clamping ring against movement.

The operation of the reamer will be readily understood from theforegoing description. Assuming the various parts to be in the positionsshown in Fig. 2, if it is desired to fhave theblade carrying portionfree to float, the screw 52 is turned so as to draw the sleeve 50 downinto the bore 47 and entirely out of the bore 17 and the opening 46 andthe said sleeve will then be in the position shown in Fig. 3 and Fig. 5.Again, it we assume the blade are in the position shown in Fig. 2 andthe other figures of the drawing and it is desired to adjust the bladesso as to securea deeper cut the lockwall of the blade holding slots.

Spanner or similar tool and isrotated on the hub 28, and as the collar70 is held against rotation owing to the lugs 71 .thereon projectinginto the blade holding slots `60 the said collar will move upwardly onblades will carry the blades upwardly, and:

as the blades move upwardly they will also move outwardly owing to theinclined inner edge of the blades andthe inclined bottom lVhen theblades have been caused to project the proper distance the clamping ring77 is screwed down on the upper ends of the blades and the locking ring80 is then screwed down on top of the clamping ring.

What I claim is 1. An expansion reamer comprising a blade carryingportion, blades mounted in said blade' carrying portion and adjustabletherein, said blade carrying portion being provided at its upper endwith a circular cavity, a shank portion, a flange carried by said shankportion and adapted to be loosely received within the cavity in theblade carf rying portion, and means locking the flange to the said bladecarrying portion while leaving it free to move transversely of the axisof the blade carrying portion.

2. An expansion reamer comprising a blade carrying portion, bladesadjustably mounted in said blade carrying portion, said serve as bumpersto protect the lower ends v blade carrying portion having a cavity inits upper surface, a shank provided with a flange adapted to fit looselywithin said of which is beveled and adapted to engage I cavity,.a diskarranged in saidv cavity between thebottom surface of the shank and thebottom wall of the cavity, said disk being provided with two pairs ofdiametrically arranged slots, a pair of diametrically arranged pinssecured in the flange of the shank portion and arranged to extend intoone pair of diametrically arranged slots in said disk and a pair ofdiametrically arranged pins secured in thel bottom wall of the cavity ofthe"blade carrying portion and arranged to extend into the other twodia- -metrically arranged slots in said disk, said pins having apositive engagement with the side walls of said slots in said disk buthaving play between the inner end walls and the walls of the cavity inthe blade carrying portion, and means for locking said flange in saidcavity.

3. An expansion reamer comprising a blade carrying portion, bladesadjustably mounted in said blade carrying portion, said bladecarryingportion having a cavity at its upper end, a shank portionprovided with a flangeM arranged to lit loosely within said cavity, adisk arranged in said cavity vv,between the lower end of the shank andVl'the bottom wall of said cavity,.said disk being provided with slotswhich extend inwardly .from the perimeter of said disk, said slots beingarranged in pairs diametrically opposite each other, holes formed in thesaid diskl pins within said slots and a ring mountedv on the shankportion and arranged to screw into the upper end of the body portion toprevent the outward movement of the shank portion.

4. An expansion reamer comprising a blade carrying portion having acavity at its upper end, blades adjustably mounted in said bladecarrying portion, a bore extending from the bottom surface of the bladecarrying portion centrally therethrough, a disk arranged in the cavityof the body portion, said disk having a central opening in line with thebore in the body portion, a shank portion adapted to extend down intosaid cavity in the blade carrying portion,

said shank portion being provided with a bore in line with the bore inthe blade carrying portion, means for forming an operative connectionbetween said shank portion and the said disk and said disk and saidblade carrying portion permitting said blade car rying portion to floaton the shank portion, a sleeve mounted within the bore of the bodyportion and adapted to slide freely therein, and in its locking positionextend through the opening in said disk and into the bore in the shankportion,` said sleeve being provided with interior screw threads, meansfor preventing the rotation of said sleeve and a screw mounted in theblade carrying portion and extending into the said sleeve and engagingthe thready thereon. i

5. An expansion reamer comprising a blade carrying portion, a shankportion connected Vwith the blade carrying portion, said blade carryingportion having a cavity extending upwardly from the bottom surfacethereof, said cavity `being annular in cross section and the bladecarrying portion extending down centrally of said cavity and forming ahub, said blade carrying portion 'having slots formed inthe peripheralwall thereof, the bottom wall of said slots being inclined to the axisof the blade carrying portion, andat the lower end of the body portionsaid slots extending completely through the body portion, blades mountedin said slots, the inner edge of each blade being inclined correspondingto the inclination of the bott'om walls of said slots and each bladebeing also provided with a notch which extends inwardly from the inneredge of the blade, a ring arranged around the hub portion of the bladecarrying portion, means for locking saidring against longitudinaldisplacement while leaving it free to turn on said hub, said ring beingprovided with an exterior screw thread,v a scr'ew threaded collararranged on said ring, said collar being provided with lugs which extendinto the blade carrying lslots and also into the notches in the saidblades and a clamping ring secured above said blades and engaging theupper end of said blades.

6. An expansion reamer comprising a blade carrying portion consisting ofa neck portion and a body portion, the neck portion being provided withan exterior screw thread and having a cavity extending down frothe uppersurface thereof and the body portion having a cavity extending upwardlyfrom the bottom surface thereof, the body portion extending downcentrally of said cavity in the form of a hub, said body portion alsobeing provided with radially ar-Y ranged blade receiving slots, thebottom walls of which are inclined at an angle to the axis of thereamer, blades arranged in said blade carrying slots, the inner edges ofsaid blades being inclined corresponding to the inclination of thebottom of said slots, but the upper edges of said blades being beveled,a beveled clamping ring arranged on the neck portion and adapted toengage the upper ends of said blades, a locking ring ar-l ranged abovethe clamping ring, an exterior screw threaded sleeve arranged on the hubportion of the bodyportion, and a screw threaded collar arranged on saidsleeve and provided with lugs which extend into the blade carrying slotsand the notches in said blades,

7. An expansion reamer comprising a blade carrying portion and a shankportion, means for securing the shank portion to the body portion so asto permit of the body portion moving transversely of the axis of the,shank portion, a cavity formed in the bottom of the body portion, a hubportion extending down centrally of said cavity, said body portion beingprovided with radially arranged blade receiving slots which extendpartially through said body portion, the bottom walls of said slotsbeing inclined to the axis of the reamer, blades arranged in the bladecarry ing slots, the inner edges of said blades being inclinedcorresponding to the inclination of .the bottom of the slots and havingnotches extending inwardly therefrom, a sleeve arranged around the hub,said sleeve being provided with an exterior screw thread, a collararranged on said sleeve, said collar being provided with lugs whichextend into the blade carrying slots and the notches in said p blades, aring arranged to screw into the bottom of the body portion for holdingsaid sleeve against longitudinal movement and locking rings mounted onthe upper end of the body portion for holding the clampingV ring againstmovement.

8. An expansion reamer comprisingv a blade carrying portion and a shankportion, the blade carrying portion being provided with a cavity adaptedto receive the lower end of the shank portion and loosely engage thesame, lneans operatively connecting the shank portion with said bladecarrying portionl so that said blade carrying portion will turn with theshank portion while leaving it free to float on the shank portion, saidblade carrying portion having an annular cavity formed in the bottomthereof, radially arranged blade receiving slots formed in the bladecarrying portion, the bottoms of said slots being inclined and at theirlower ends communicatin with said cavity, a sleeve arranged aroun thecentral part of the blade carrying portion, a collar mounted on saidsleeve," said collar having lugs adapted to engage with the blades inthe blade receiving slots and a ring arranged to screw into the lowerend of the blade carrying portion and engage said sleeve, said ringhaving slots corresponding to the slots in the blade carrying portionand adapted to receive the lower portions ofthe blades.

In testimony whereof, I sign the foregoing' specification, in thepresence of two witnesses.

DELANO H. DUGAR. Witnesses v B. C. BROWN, V. C. LYNCH.

